CMC TRIGGERS AR-15 CARBINE BUFFER TUBE KIT - MIL-SPEC - ENHANCED QD Now manufactured and assembled in-house in Fort Worth, Texas! Compatible with Mil-Spec AR-15 stocks, this kit contains all the necessary parts to mount a stock assembly onto your lower receiver. Six position AR-15 buffer tube is machined from 6061-T6 aluminum with a MIL-A-8625 Type II, Class 2 standard anodized finish. The design features a precise drainage hole that removes water from the system in marine environments. For optimal performance, our standard offering includes a carbine recoil buffer body and quick detach receiver end plate are made from 6061 aluminum, a spring made from high-tensile steel, and a castle nut is made from high-carbon steel. Complete your lower build by adding your favorite CMC Trigger and CMC Lower Parts Kit. 6061-T6 Grade Aluminum 6 Position Mil-Spec Carbine Buffer Tube Carbine Recoil Buffer 3oz High-Quality Recoil Spring Castle Nut & QD Receiver End Plate Made in the USA